Drying apparatus for treating pyroxyline



no Model.)

J. B. EDSON-v DRYING APPARATUS FOR TREATING PYROXYLINE,-&c.

No. 249, 00. Patented N'ov.15,1881

N Parana Pholo-hlhagmphor. WHSIHMIOIL n, c.

UNITED STATES PATENT .OFFIcE. T

JARVIS B. EDSON, or NEWARK, NEW JERSEY.

D'RYlN G/ \PPARATUS or; TREATING PYROXYLINE, swig SPECIFICATIONforming part of Letters lfatent No. 249,600, dated November 15, 1881. V

' Application filed September 14, 1881. (No model.)

' 1 Thisinventionhasfor its objectthe complete removal of the moisture, either of water or other chemical substances, from pyroxyline and othersimilar bodiesthat are liable to explode or decompose atlow temperatures during their process of manufacture; and the inventionco'n sists, first, in the method of introducing very dry air which has'been cooled under pressure into the substances to be dried, but at a temperature slightly above the freezing-point, so that the moisture of the materialsunder treatment will not be frozen, but quickly absorbed and carried away,-as will hereinafter appear.

Second, the invention also consists in the combination of a receiverfor holding the materials to be dried with air cooling and drying apparatus and an intermediate heater for controlling the temperature of the cold and dry air, as will hereinafter appear.

Third, the invention furtherconsists in the combination of areceiver for holding the materials with an agitating apparatus and air distributing and discharging devices, as will hereinafter appear.

Fourth, the invention further consists in the combination of a receiver for holding the materials with an exhaust apparatus and intermediate inlet and discharge passages, as will hereinafter appear. I

1n the drawings, Figure l is a sectional elevation of the entire apparatus, and Fig. 2 is a cross-section of the receiver, and represents the material in a pulverulent state and as acted upon by the agitators. I

Various forms of the apparatus may be devised but a convenient and very practical form is here shown, where A is the receiver for holdin g the material to be dried. This receiver is of cylindrical form, conveniently made of metal, and'formed with flanges A, to support the cylinder on ro1lersA or wheels on shafts A one of which is provided with a fast and loose pullcy, A and A to carry a belt for rotating the cylinder. Itis also provided with openings A V and A", for theintroduction and discharge of the material, and for permitting the workmen to'enter it for cleansing when required. Upon the interior are fastenedlifting-plates B, for

the purpose of carrying up the materialand lettingit fall in showers upon the incoming air, which is introduced through a pipe at G, con cent'ric with the axis ofthe cylinder A, and

may extendits entire length, and, for the thor- 6o venient points on the end of the cylinder, one

ofwhich is shown at O a v The cold air is produced in any ofthe wellknown ways by which it may be rendered intensely dry and free from any dust or other impurities,dryness with a low degree of cold, but

above freezing, being the essential requisites in my process. Consequently I have selected as preferable the apparatus of one Reynolds,

recently patented,in which the air, under great pressure from the pumps, is forced through a column of water, as indicated at D, in a cylinder, D, the upper portion of which constitutes the air-reservoir, and from which apipe, E, couducts the cold and dry air to a heating-chamher, which maybe of any of the well-known forms of such devices, but in this case consists of an interior cylinder, F, for'stear'n and an exterior cylinder, F, to form a heating-space between the two for the air, as at F, and with which the pipe E is connected. The water in the cooling-chamber D is supplied through a pipe at D and it escapes at D and the air from I the compressing-pom p is introduced at D, passin g up through the water, as indicated by the arrows, and to perfectly distribute it baffle-plates 0 may be used in the water, as shown at D The airfrom the heater at F is conducted by a pipe at G, having a cock, G,to the receiverA, where it escapes through the perforated pipe at O, and,

- being inten scly dry and slightly heated to a lit:

tle above the freezing-point, readily absorbs" the moisture from the agitated material andcarries it off at the discharge-cocks 0.

As a preliminary step in the drying process,

a vacuum and heating apparatus for the ordi- I00 nary atmosphere may be used, in which air may be heated at K in a heater similar to the one at F through cock L to the pipeO in the receiver or drying-cylinder, and, when saturated with moisture, the inlet-cock at L is closed andanothercock at M is opened in the pipeM,

leading to a suction-fan or exhauster, and the air is drawn off through the perforations in pipe until a partial. vacuum is produced in the receiver A. Then the cockMis closed,

, and the one at L is opened, and another supply of warm air is introduced, as before.

Instead of the suction fan being used, the pipe at G may terminate at H in an enlarged pipe to form a suction from the heater K through the pipe L, and thus, on the injector principle, force the outside air into the receiver during the first portion of the process. Both the heaters are supplied with steam through pip e N and cooks N and N and they have an outlet for the condensed water at 0 and O.

A cock at P in pipe E controls the supply of air from the reservoir.

I therefore claim- 1. Themethodofdryingpyroxylineand other similar substances by the use of cold and intensely dry air, maintained at a temperature slightly above the freezing-point, and introduced through the material while in a finelydivided condition, and thence discharged from the receiver, as hereinbefore set forth.

2. The combination of a reservoir'for coolin g and drying the air, a heater for raising its temperature when desired, and the receiver for holding and agitating the material to be treated,

as hereinbefore set forth; 1

3. The combination of a revolving receiver having agitating devices, as described, with a perforated conduit and air-cooling apparatus, as and for the purposes hereinbefore set forth.

4. v The combination of a revolvingireceiver having lifting-or agitating devices with an exhausting or suction apparatus, as hereinbefore set forth."

5. The combination of the, heating devices with a receiver havin g lifting-plates or agitators and a suction or exhaust apparatus, as

hereinbefore set forth. y

In witness whereof I have hereunto subscrlbed'my name and affixed my seal in the presence of two subscribing witnesses.

JARVIS B. EDSON. [L. s.)

Witnesses EUGENE N. ELIOT, BOYD ELIOT. 

